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Employee Benefit Plans (Benefit Cost Components) (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost CAD 35 CAD 22
Defined Benefit Plan, Interest Cost 79 59
Defined Benefit Plan, Expected Return on Plan Assets (97) (65)
Defined Benefit Plan, Amortization of Gains (Losses) 42 48
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1) (1)
Current year amortization of regulatory assets liabilties 9 0
Net Periodic Benefit Cost, Total 67 63
Non-pension Benefit Plans [Member    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost 4 3
Defined Benefit Plan, Interest Cost 9 4
Defined Benefit Plan, Expected Return on Plan Assets (1) 0
Defined Benefit Plan, Amortization of Gains (Losses) 2 1
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (8) (6)
Current year amortization of regulatory assets liabilties 0 0
Net Periodic Benefit Cost, Total CAD 6 CAD 1